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Vulnerabilities

Vulnerability · CVE-2026-96909

Windows BitLocker Remote Code Execution Vulnerability

Published Oct 13, 2026 · catalog updated Oct 16, 2026 · Microsoft Windows 11 version 23H2

Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.9%
Remediation
Advisory link
Affected products
vendor Microsoft Windows 11 Version 23H2 · vendor Microsoft Windows 11 Version 24H2 · vendor Microsoft Windows 11 Version 25H2 · vendor Microsoft Windows 11 Version 26H2 · vendor Microsoft Windows 11 version 23H2 · vendor Microsoft Windows 11 version 26H1

Heap-based buffer overflow in Windows BitLocker allows an unauthorized attacker to execute code over a network.

Technical analysis

Mechanism and impact are interpreted from ingested advisories — not independent exploit research.

  • CWE classification

    Heap-based Buffer Overflow

  • Prerequisites and impact

    Follow the original vendor advisory for access prerequisites and impact. This catalog does not invent exploit conditions.

How to fix CVE-2026-96909

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

CVE-2026-96909 is a critical public vulnerability record for Microsoft Windows 11 version 23H2. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether Microsoft Windows 11 version 23H2 is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: Microsoft Windows 11 Version 23H2; Microsoft Windows 11 Version 24H2; Microsoft Windows 11 Version 25H2; Microsoft Windows 11 Version 26H2. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 9.8 (technical impact); EPSS 0.9% (30-day exploitation probability). It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-122. Sources contributing to this record: cve_org, epss, tenable. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Related intelligence

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 16, 2026 · Tenable CVE Database

    Detected

    Heap-based buffer overflow in Windows BitLocker allows an unauthorized attacker to execute code over a network.

  2. Oct 16, 2026 · CVE.org

    Updated

    Heap-based buffer overflow in Windows BitLocker allows an unauthorized attacker to execute code over a network.

Affected versions

Enter an installed version to get a verified affected / not-affected result against the ranges below.

  • vendor Microsoft Windows 11 Version 23H2version unspecified
  • vendor Microsoft Windows 11 Version 24H2version unspecified
  • vendor Microsoft Windows 11 Version 25H2version unspecified
  • vendor Microsoft Windows 11 Version 26H2version unspecified
  • vendor Microsoft Windows 11 version 23H2version unspecified
  • vendor Microsoft Windows 11 version 26H1version unspecified
  • vendor Microsoft Windows Server 2022version unspecified
  • vendor Microsoft Windows Server 2025version unspecified

Sources

  • CVE.orgVulnerability recordCVE-2026-96909

    Heap-based buffer overflow in Windows BitLocker allows an unauthorized attacker to execute code over a network.

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-96909

    30-day exploitation probability 0.9%

    first.org
  • Tenable CVE DatabaseVulnerability recordCVE-2026-96909

    Heap-based buffer overflow in Windows BitLocker allows an unauthorized attacker to execute code over a network.

    tenable.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.